While there is certainly a problem with racism in Police Departments this article fails to find the ultimate source of that racism, and without truly understanding where Police racism is coming from the authors solution of "We need harsher punishments and better oversights" doesn't guarantee it will fix the problem.
Like with the public in general, only a small (but very loud) percentage of the Police are bad people. Bringing harsher punishments down on the Police is not the answer. By their very nature the Police need to do things that put dangerous people in harms way for the safety of others. If they are not allowed to do that without thinking that they're going to get punished for it, they will not be able to do their jobs effectively.
There are definitely cases where bad Police do bad things, and they DO get punished for it, but just like every other person in America they are innocent until proven guilty, and it can take a long time before a case can be put together. By that time the media (and the Public's attention) have been pointed to the next "Police tragedy".